html,
body,
#app {
    height: 100%;
}


.app {
    height: 100%;
}


.df {
    display: flex;
}

.jsc {
    justify-content: center;
}

.aic {
    align-items: center;
}

.fdc {
    flex-direction: column;
}

.f1 {
    flex: 1
}